| This layout contains multiple panels, each fit to the container, where only a single panel can be visible at any given time.
This layout style is most commonly used for wizards, tab implementations, etc.
The CardLayout's focal method is setActiveItem. Since only one panel is displayed at a time, the only way to move
from one panel to the next is by calling setActiveItem, passing the id or index of the next panel to display. The layout
itself does not provide a mechanism for handling this navigation, so that functionality must be provided by the developer.
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